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If you know Kb for ammonia, NH3, you can calculate the equilibrium constant, Ka, for the following reaction:

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If you know Kb for ammonia, NH3, you can calculate the equilibrium constant, Ka, for the following reaction:

NH4 + ⇌  NH3 + H+ by the equation:

a) Ka = KwKb

b) Ka = Kw / Kb 

c) Ka = 1 / Kb 

d) Ka = Kb / Kw

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b) Ka = Kw / Kb

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